A long-term test system for an electric heating element

Abstract

The present application relates to the technical field of reactor thermal hydraulic test, in particular to a long-term test system for electric heating element. The test system comprises a test water tank, a pressure stabilizer and a power supply device. The electric heating element is inserted into the test water tank, and the upper power supply line is connected to the power supply device. The electric heating element heats the liquid in the test water tank to provide a high-temperature environment. The gas in the pressure stabilizer expands and contracts to stabilize the pressure of the test loop. The heating power of the electric heating element is adjusted by changing the output current of the power supply, thereby controlling the temperature and pressure rising rate of the test loop, and realizing the long-term test of the electric heating element under various temperature and pressure environments.

Description

Technical Field

[0001] This application relates to the field of reactor thermal-hydraulic testing technology, specifically to a long-term testing system for an electric heating element. Background Technology

[0002] Nuclear power safety is the most important task in the development of nuclear energy applications. To verify the safety of nuclear reactors under normal operating conditions and accident conditions, a series of thermal-hydraulic tests are required. In advanced reactor test and research platforms both domestically and internationally, metal elements with electrically heated loads are often used to simulate reactor core fuel rods. In addition, electrically heated elements are often used as important components in the pressurization systems of nuclear power plants. These electrically heated elements often need to operate for extended periods in harsh environments such as high temperature and high pressure, or undergo exposed dry burning during accident conditions in thermal-hydraulic tests. Therefore, their sealing and insulation performance after long-term operation under extreme conditions or high temperature and high pressure is particularly important.

[0003] Current methods for testing the performance of electric heating elements include non-destructive testing (NDT) and hydrostatic testing. NDT uses methods such as penetrant testing and radiographic testing to examine the sealing performance of electric heating elements; however, these methods often have limitations. For example, undetected micro-defects can easily compromise the sealing performance of electric heating elements after long-term operation under high temperature and pressure, posing a safety hazard. Hydrostatic testing typically tests the sealing performance of electric heating elements in cold conditions, while the safety and reliability of electric heating elements under high temperature and pressure still require further verification. Summary of the Invention

[0004] The purpose of this application is to provide a long-term testing system for electric heating elements, providing a high-temperature and high-pressure environment for long-term testing of electric heating elements.

[0005] The technical solution to achieve the purpose of this application is as follows:

[0006] A long-term testing system for an electric heating element includes a testing water tank, a voltage regulator, and a power supply device.

[0007] The test tank is filled with test liquid, and the part of the electric heating element to be tested is immersed in the test liquid; the upper part of the voltage regulator is a gas space and the lower part is a liquid space, and the lower part of the voltage regulator is connected to the inside of the test tank through a pipeline;

[0008] The electric heating element is inserted into the test water tank, and the power supply wire at the top extends out of the test water tank and is connected to the power supply device.

[0009] Optionally, the top of the voltage regulator is connected to a charging and discharging pipeline, and the gas charging and discharging is controlled by a regulating valve to form a gas space in the upper part of the voltage regulator. The volume of the upper gas space is changed by the expansion and contraction of the lower liquid space.

[0010] The bottom of the voltage regulator is connected to a replenishment / drainage fluid line, and the replenishment / drainage of the fluid is controlled by a regulating valve.

[0011] Optionally, a safety valve device is connected to the top of the voltage regulator to provide pressure protection for the test system.

[0012] Optionally, the upper part of the test tank is a sealed head;

[0013] Insert the connecting pipe into the center hole at the top of the test water tank. The connecting pipe extends out of the test water tank and is welded and fixed to the sealing head.

[0014] Optionally, a wiring sleeve is fitted over the electric heating element, and the wiring sleeve is inserted into the connecting pipe with an adjustable insertion depth.

[0015] Optionally, the ferrule is fitted over the wiring sleeve to securely seal the electric heating element.

[0016] Optionally, the power supply output current is adjustable to change the heating power of the electric heating element.

[0017] Optionally, the upper gas space of the voltage regulator is filled with nitrogen, and the lower liquid space is filled with water.

[0018] Optionally, both the test tank and the pressure regulator are equipped with temperature measuring devices, pressure measuring devices, and liquid level measuring devices.

[0019] Optionally, an insulation signal detection device may be installed within the power supply unit.

[0020] The beneficial effects of this application are as follows:

[0021] This application provides a long-term testing system for an electric heating element, comprising a test tank, a voltage regulator, and a power supply. The electric heating element is inserted into the liquid in the test tank, heating the tank and causing the liquid inside to expand. Hot water enters the voltage regulator through a pipeline, causing the gas space above the voltage regulator to contract. When the temperature inside the test tank drops and the liquid space contracts, the gas space above the voltage regulator expands, thereby stabilizing the internal pressure of the test tank. The power supply of the electric heating element is connected to the power supply. Changing the power output current adjusts the heating power of the electric heating element, controlling the rate of temperature and pressure increase in the test circuit. This enables long-term testing of the electric heating element under various temperature and pressure conditions, providing a testing environment for the electric heating element to operate long-term under harsh conditions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of the long-term testing system for electric heating elements;

[0024] Figure 2 A schematic diagram of the fastening connection method for electric heating elements;

[0025] Figure reference numerals: 1-Electric heating element; 11-Wiring sleeve; 12-Power supply wiring;

[0026] 2-Test water tank; 3-Pressure stabilizer; 4-Replenishment and drainage pipeline; 5-Inflation and exhaust pipeline; 6-Power supply device; 7-Safety valve device; 8-Connecting pipe; 9-Sealing head; 10-Flange. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] See Figure 1 The figure is a schematic diagram of the structure of a long-term test system for an electric heating element provided in an embodiment of this application.

[0031] This application provides a long-term testing system for an electric heating element, characterized in that it includes a test water tank 2, a voltage regulator 3, and a power supply device 6;

[0032] The test tank 2 is filled with test liquid. The part of the electric heating element 1 to be tested is immersed in the test liquid to heat the test liquid and provide a high-temperature test environment. The upper part of the voltage regulator 3 is a gas space and the lower part is a liquid space. The lower part of the voltage regulator 3 is connected to the inside of the test tank 2 through a pipeline.

[0033] The electric heating element 1 is inserted into the test water tank 2, and the power supply wire 12 at the top extends out of the test water tank 2 and is connected to the power supply device 6.

[0034] In some possible implementations of the embodiments of this application, the top of the voltage regulator 3 is connected to the charging and discharging pipeline 5, and the gas charging and discharging is controlled by the regulating valve so that a gas space is formed in the upper part of the voltage regulator, and the volume of the upper gas space is changed by the expansion and contraction of the lower liquid space.

[0035] The bottom of the voltage regulator 3 is connected to the replenishment / drainage fluid line 4, and the replenishment / drainage of the fluid is controlled by the regulating valve.

[0036] In one example, a safety valve device 7 is connected to the top of the voltage regulator 3 to provide pressure protection for the test system.

[0037] In some possible implementations of the embodiments of this application, such as Figure 2 As shown, the upper part of the test water tank 2 is the sealing head 9;

[0038] The test water tank 2 has a central hole at the top where the connecting pipe 8 is inserted. The connecting pipe 8 extends out of the test water tank 2 and is welded and fixed to the sealing head 9. The part of the connecting pipe 8 that extends out of the test water tank 2 is much shorter than the part that is inserted.

[0039] In one example, the electric heating element 1 is fitted with a wiring sleeve 11, which is inserted into the connector 8, and the insertion depth is adjustable.

[0040] Optionally, the connecting sleeve 11 and the connecting pipe 8 are provided with threads or other auxiliary connection parts to increase the tightness of the connection;

[0041] It is understandable that changing the depth of the insertion of the wiring sleeve 11 into the connecting pipe 8, that is, changing the length of the electric heating element 1 used for heating, can have a slight effect on the temperature inside the test water tank 2, and should be considered as a condition that may affect the test temperature.

[0042] The ferrule 10 is fitted over the wiring sleeve 11 to securely seal the electric heating element 1.

[0043] Disassembly between the ferrule 10, the wiring sleeve 11, and the connecting pipe 8 is simple. Understandably, the electric heating element 1 can be replaced with different types of electric heating loads.

[0044] In some possible implementations of the embodiments of this application, the output current of the power supply device 6 is adjustable to change the heating power of the electric heating element 1;

[0045] It is understandable that changing the heating power of electric heating element 1 can control the rate at which the test circuit heats up and pressurizes.

[0046] In one example, the power supply unit 6 is equipped with an insulation signal detection device to monitor the performance of the electric heating element 1 by observing the insulation signal.

[0047] In some possible implementations of the embodiments of this application, the upper gas space of the voltage regulator 3 is filled with nitrogen, and the lower liquid space is filled with water;

[0048] It is understandable that the partition between the gas space and the liquid space can move up and down, and the expansion and contraction of the liquid space causes the gas space to contract and expand, thus providing volume compensation.

[0049] In some possible implementations of the embodiments of this application, both the test tank 2 and the pressure regulator 3 are equipped with a temperature measuring device, a pressure measuring device, and a liquid level measuring device;

[0050] Optionally, the temperature measuring device, pressure measuring device, and liquid level measuring device can be thermocouples, pressure sensors, or liquid level gauges.

[0051] The following is a detailed explanation of the usage method of a long-term testing system for electric heating elements provided in this application, using a specific example.

[0052] Water is injected into the connection area between the liquid space of the pressure regulator 3 and the test water tank 2 through the replenishment and drainage pipeline 4, and the initial pressure in the test system is the water pressure.

[0053] Nitrogen gas is introduced into the gas space of the pressure regulator 3 through the charging and discharging pipeline 5. The gas space expands, and the pressure measurement device of the pressure regulator 3 is read. Nitrogen gas is introduced to stop when the system pressure is close to the experimental value.

[0054] Adjust the output current of the power supply device 6 to change the heating power of the electric heating element 1 and control the rate of temperature and pressure rise in the circuit; read the values ​​of the temperature measuring device and pressure measuring device of the test water tank 2, and stop heating after the system temperature and pressure reach the target experimental values;

[0055] An insulation signal detection device is installed inside the power supply unit 6 to monitor the insulation signal of the power supply unit during the test, so as to observe the state change of the electric heating element 1 during the test and realize the monitoring of the performance of the electric heating element 1.

[0056] The embodiments of this application have the following beneficial effects:

[0057] (1) The electric heating element is inserted into the liquid in the test water tank and provides a high-temperature environment by heating. Heating the test water tank causes the liquid inside to expand due to heat. Hot water enters the pressure regulator through the pipeline, and the gas space at the top of the pressure regulator contracts. When the temperature inside the test water tank drops and the liquid space contracts, the gas space at the top of the pressure regulator expands, thereby stabilizing the internal pressure of the test water tank and enabling long-term testing of the electric heating element under various temperature and pressure conditions, providing a test environment for the electric heating element to operate for a long time under harsh conditions.

[0058] (2) Connect the power supply of the electric heating element to the power supply device, and change the power output current to adjust the heating power of the electric heating element, which can control the rate of temperature rise and pressure rise of the test circuit.

[0059] (3) The electric heating element is fitted with a wiring sleeve. The connecting pipe is inserted and tightened through the wiring sleeve and sealed by the clamp. The installation is firm and the disassembly is simple. It can be tested for different electric heating loads.

[0060] The present application has been described in detail above with reference to the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present application. All content not described in detail in this application can be derived from existing technology.

Claims

1. An electrical heating element long-term durability test system, characterized by, Includes a test tank (2), a voltage regulator (3), and a power supply unit (6); The test tank (2) is filled with test liquid, and the part of the electric heating element (1) to be tested is immersed in the test liquid; the upper part of the voltage regulator (3) is a gas space and the lower part is a liquid space. The lower part of the voltage regulator (3) is connected to the inside of the test tank (2) through a pipeline. The electric heating element (1) is inserted into the test water tank (2), and the power supply wire (12) at the top extends out of the test water tank (2) and is connected to the power supply device (6); An insulation signal detection device is installed inside the power supply unit (6).

2. The long-term durability test system of an electric heating element according to claim 1, wherein The top of the voltage regulator (3) is connected to the charging and discharging pipeline (5). The gas charging and discharging is controlled by the regulating valve so that a gas space is formed in the upper part of the voltage regulator. The volume of the upper gas space is changed by the expansion and contraction of the lower liquid space. The bottom of the voltage regulator (3) is connected to the replenishment and drainage pipeline (4), and the liquid filling and drainage are controlled by the regulating valve.

3. The long-term testing system for an electric heating element according to claim 2, characterized in that, The voltage regulator (3) is connected to a safety valve device (7) at the top to provide pressure protection for the long-term test system of the electric heating element.

4. The long-term testing system for an electric heating element according to claim 1, characterized in that, The upper part of the test water tank (2) is a sealing head (9); The test water tank (2) has a central hole at the top, into which the connecting pipe (8) is inserted. The connecting pipe (8) extends out of the test water tank (2) and is welded and fixed to the sealing head (9).

5. The long-term testing system for an electric heating element according to claim 4, characterized in that, The electric heating element (1) is fitted with a wiring sleeve (11), and the wiring sleeve (11) is inserted into the connector (8) with an adjustable insertion depth.

6. The long-term testing system for an electric heating element according to claim 5, characterized in that, The ferrule (10) is fitted over the wiring sleeve (11) to secure and seal the electric heating element (1).

7. The long-term testing system for an electric heating element according to claim 1, characterized in that, The power supply device (6) has an adjustable output current to change the heating power of the electric heating element (1).

8. The long-term testing system for an electric heating element according to claim 1, characterized in that, The upper gas space of the voltage regulator (3) is filled with nitrogen, and the lower liquid space is filled with water.

9. The long-term testing system for an electric heating element according to claim 1, characterized in that, The test tank (2) and the pressure regulator (3) are equipped with temperature measuring devices, pressure measuring devices and liquid level measuring devices.

Images